625

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625 < 624 | 626 >
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620	621	622	623	624	625	626	627	628	629
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680	681	682	683	684	685	686	687	688	689
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The number 625 is called fara in D’ni. It is equal to 5⁴, or 25².

Properties

• Its factors are 1, 5, 25, 125 and 625, making it a composite number.
• 625 is an odd number .
• 625 is an unhappy number.
  

• 625 is a centered octagonal number.
  
• 625 is deficient.
  
• Its prime factorization is 5⁴.
  
• It was also the number of scan lines in many analog television standards for a time.

Approximations

Notation	Lower bound	Upper bound
Up-arrow notation	25 ↑ 2
Scientific notation	6.25 x 102	6.251 x 102
Slow-growing hierarchy	\(g_{\omega^{\omega}}(4)\)	\(g_{\omega^{\omega}}(5)\)
Copy notation	5[3]	6[3]
Chained arrow notation	25 → 2
Bowers' Exploding Array Function/Bird's array notation	{25,2}
Fast-growing hierarchy	f2(6)	f2(7)
Hardy hierarchy	Hω(312)	Hω(313)
Middle-growing hierarchy	m(ω,9)	m(ω,10)
Hyper-E notation	E2.7959
Hyper-E notation (non-10 base)	\(E[25]2\)
Hyperfactorial array notation	5!	6!
X-Sequence Hyper-Exponential Notation	25{1}2
Steinhaus-Moser Notation	4[3]	5[3]
PlantStar's Debut Notation	[1]	[2]
H* function	H(-0.1)	H(-0)
Bashicu matrix system with respect to version 4	(0)[25]	(0)[25]
m(n) map	m(1)(4)	m(1)(5)
s(n) map	\(s(1)(\lambda x . x+1)(311)\)	\(s(1)(\lambda x . x+1)(312)\)